export default {
  namespaced: true,
  
  state: () => ({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  
  mutations: {
    addToCart(state, goods) {
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     if(!findResult) {
       state.cart.push(goods)
     } else {
       findResult.goods_count ++
     }
     this.commit('m_cart/saveToStore')
    },
    saveToStore(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    updateGoodsState(state, goods) {
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     if(findResult) {
       findResult.goods_state = goods.goods_state
     }
     this.commit('m_cart/saveToStore')
    },
    updateGoodsCount(state, goods) {
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     if(findResult) {
       findResult.goods_count = goods.goods_count
     }
     this.commit('m_cart/saveToStore')
    },
    removeGoodsById(state, goods_id) {
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
    this.commit('m_cart/saveToStore')
    },
    updateAllGoodsState(state, newState) {
      state.cart.map(x => x.goods_state = newState)
      this.commit('m_cart/saveToStore')
    }
  },
  
  getters: {
    // 购物车中商品的总数量
    total(state) {
      // let c = 0
      // state.cart.map(x => c += x.goods_count)
      // return c
     return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    // 购物车中已勾选商品的总数量
    checkedCount(state) {
     return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    // 已勾选商品总价格
    allCheckedGoodsAmount(state) {
     return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0).toFixed(2)
    }
  }
}